Mixed-cation perovskite solar cells in space

Tu, Yongguang; Xu, Guoning; Yang, Xiaoyu; Zhang, Yifei; Li, ZhaoJie; Su, Rui; Luo, Deying; Yang, Wenqiang; Miao, Yanli; Cai, Rong; Jiang, Luhua; Du, Xiaolong; Yang, Yanchu; Liu, Qianshi; Gao, Yang; Zhao, Shuai; Huang, Wei; Gong, Qihuang; Zhu, Rui

doi:10.1007/s11433-019-9356-1

Cited by 138 publications

(122 citation statements)

References 26 publications

Supporting

Mentioning

120

Contrasting

Unclassified

Order By: Relevance

“…Subsequently, tri‐cation perovskites were deposited onto the LDC‐modified substrates using the methods reported in the literatures. [ 35,36 ] Other functional layers were also made in sequence following previously published protocols. [ 6,37 ] The J – V curves were measured with a Keithley 2400 source‐measure unit under dark and green light illumination (520 nm, Shenzhen Optoelectronic Technology Co., Ltd.).…”

Section: Methodsmentioning

confidence: 99%

Low‐Dimensional Contact Layers for Enhanced Perovskite Photodiodes

Luo

Zou

Yang

et al. 2020

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

Controlling defects and energy‐band alignments are of paramount importance to the development of high‐performance perovskite‐based photodiodes. Yet, concurrent improvements in interfacial contacts and defect reduction simply by tailoring bottom contacts have not been investigated. An effective strategy is reported that can simultaneously improve energy‐band alignments and structural defects by introducing low‐dimensional contact (LDC) layers at the bottom interface. It is found that LDC‐based perovskites considerably suppress undesirable structural defects induced by microstrains, resulting in reduced nonradiative recombination centers and improved carrier lifetimes. Additionally, the resulting LDC‐based interface structures help block minority carrier injection from the electrodes by forming built‐in electric fields. As a consequence, LDC‐based perovskite photodiodes showed improved light detection capabilities. The result opens an avenue to yield highly efficient photodiodes.

show abstract

Section: Methodsmentioning

confidence: 99%

Low‐Dimensional Contact Layers for Enhanced Perovskite Photodiodes

Luo

Zou

Yang

et al. 2020

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…Polycrystalline halide perovskites are of enormous excitement to be applied in highly efficient solar cells, [ 1–3 ] light‐emitting diodes, [ 4 ] lasers, [ 5,6 ] and high‐sensitivity photodetectors [ 7,8 ] due to their low fabricating costs [ 9,10 ] and excellent optoelectronic properties. [ 11 ] In order for these optoelectronic devices to access their theoretical performance limits, key metrics such as charge‐carrier lifetimes and diffusion lengths in perovskite films should be maximized, which are sensitive to the density of sub‐bandgap trap states acting as nonradiative recombination centers.…”

Section: Figurementioning

confidence: 99%

Superior Carrier Lifetimes Exceeding 6 µs in Polycrystalline Halide Perovskites

et al. 2020

Self Cite

View full text Add to dashboard Cite

such as charge-carrier lifetimes and diffusion lengths in perovskite films should be maximized, which are sensitive to the density of sub-bandgap trap states acting as nonradiative recombination centers. [12,13] Long carrier lifetimes and diffusion lengths imply a reduction in trap densities constituted by multidimensional defects that can be broadly observed at the grain boundaries and surfaces of polycrystalline perovskite films. Therefore, defect modulation to efficiently suppress the undesired nonradiative recombination pathways in perovskite films have resulted in dramatically enhanced carrier lifetimes and diffusion lengths, which can be translated into higher open-circuit voltage (V OC) of photovoltaic devices. [14-18] Recently, surface post-treatments, such as depositing a layer of ammonium salts onto the perovskites, are the most frequently employed strategies, passivating the defects in the topmost area of the perovskite films. [19-22] However, the additional depositing procedure is considered to bring much uncertainty to the original perovskite films. [23,24] Recently, Yoo et al. demonstrated that the commonly used solvents (e.g., isopropanol) for dissolving ammonium salts, due to their strong polarity, had negative effects on the underlying perovskite films. [25] Lead halide perovskite films have witnessed rapid progress in optoelectronic devices, whereas polycrystalline heterogeneities and serious native defects in films are still responsible for undesired recombination pathways, causing insufficient utilization of photon-generated charge carriers. Here, radiationenhanced polycrystalline perovskite films with ultralong carrier lifetimes exceeding 6 μs and single-crystal-like electron-hole diffusion lengths of more than 5 μm are achieved. Prolongation of charge-carrier activities is attributed to the electronic structure regulation and the defect elimination at crystal boundaries in the perovskite with the introduction of phenylmethylammonium iodide. The introduced electron-rich anchor molecules around the host crystals prefer to fill the halide/organic vacancies at the boundaries, rather than form low-dimensional phases or be inserted into the original lattice. The weakening of the electron-phonon coupling and the excitonic features of the photogenerated carriers in the optimized films, which together contribute to the enhancement of carrier separation and transportation, are further confirmed. Finally the resultant perovskite films in fully operating solar cells with champion efficiency of 23.32% are validated and a minimum voltage deficit of 0.39 V is realized. Polycrystalline halide perovskites are of enormous excitement to be applied in highly efficient solar cells, [1-3] light-emitting diodes, [4] lasers, [5,6] and high-sensitivity photodetectors [7,8] due to their low fabricating costs [9,10] and excellent optoelectronic properties. [11] In order for these optoelectronic devices to access their theoretical performance limits, key metrics

show abstract

“…The perovskite solar cells (PSCs) based on lead amine halide are particularly distinctive in various photovoltaic technologies due to its unique characteristics, [ 1–4 ] such as low‐cost manufacturing technology, [ 5,6 ] adjustable band gap, [ 7 ] high absorption factor, [ 8,9 ] and low exciton binding energy. [ 10,11 ] The prominent performance of PSC has rapidly increased its certified power conversion efficiency (PCE) from 3.8% [ 12 ] in 2009 to 25.2% at present, [ 13 ] which have aroused enormous concern by industry and academia.…”

Section: Introductionmentioning

confidence: 99%

Additive Engineering by Bifunctional Guanidine Sulfamate for Highly Efficient and Stable Perovskites Solar Cells

Liu

Yang

et al. 2020

Small

View full text Add to dashboard Cite

High efficiency and good stability are the challenges for perovskite solar cells (PSCs) toward commercialization. However, the intrinsic high defect density and internal nonradiative recombination of perovskite (PVK) limit its development. In this work, a facile additive strategy is devised by introducing bifunctional guanidine sulfamate (GuaSM; CH6N3+, Gua+; H2N−SO3−, SM−) into PVK. The size of Gua+ ion is suitable with Pb(BrI)2 cavity relatively, so it can participate in the formation of low‐dimensional PVK when mixed with Pb(BrI)2. The O and N atoms of SM− can coordinate with Pb2+. The synergistic effect of the anions and cations effectively reduces the trap density and the recombination in PVK, so that it can improve the efficiency and stability of PSCs. At an optimal concentration of GuaSM (2 mol%), the PSC presents a champion power conversion efficiency of 21.66% and a remarkably improved stability and hysteresis. The results provide a novel strategy for highly efficient and stable PSCs by bifunctional additive.

show abstract

Mixed-cation perovskite solar cells in space

Cited by 138 publications

References 26 publications

Low‐Dimensional Contact Layers for Enhanced Perovskite Photodiodes

Low‐Dimensional Contact Layers for Enhanced Perovskite Photodiodes

Superior Carrier Lifetimes Exceeding 6 µs in Polycrystalline Halide Perovskites

Additive Engineering by Bifunctional Guanidine Sulfamate for Highly Efficient and Stable Perovskites Solar Cells

Contact Info

Product

Resources

About